HIOKI RM3544 ENG.pdf

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Portable, easy to use, and easy to understand
Design is ideal for maintenance and testing/

measurement of large products

The included strap can be looped around the neck to support the instrument, leaving the operator’s hands free to hold probes for measurement. The meter uses eight AA alkaline batteries, which provide
enough power for approximately 10 hours of testing under normal
operating conditions. (Operating times vary with measurement conditions.)

Auto-hold and auto-memory functionality

The RM3548 features auto-hold and auto-memory functionality to
automatically hold and record data simply by placing the probes in
contact with the desired measurement location. This functionality
allows measured values to be recorded automatically as soon as
they stabilize without the need for the user to operate any switches.


By installing the LED COMPARATOR ATTACHMENT close to a
probe, you can capture judgment
results without moving your eyes
away from the measurement location and probe.

No zero adjustment

Accuracy is defined without any need to perform zero-adjustment.
Measurement can be performed as soon as the instrument is turned on.

Dramatically improved overvoltage resistance

Green light
IN state

Red light
HI/LO state

Protection is provided against overvoltage input of up to 70 V, preventing damage caused by connecting the instrument to an electrical
charge or by the effects of the counter-EMF from inductance.

Offset Voltage Compensation(OVC)

Thermal EMF occurs at the contact point of different metals.
This voltage affects measurements, and if large enough, can cause
measurement errors. The offset voltage compensation function
minimizes the effect of thermal EMF to maintain measurement
accuracy. Particularly when measuring low resistances where the
detection voltage is small, and during low-power resistance measurements, OVC is essential to maintain accuracy.

Length conversion function

By setting a resistance value per meter, it is possible to convert
resistance values into lengths. This capability is useful when managing cable inventory or estimating PCB pattern lengths.

Circuit protection detection state

(Alerts the operator to overvoltage
input with a screen display and an
audible warning.)

Acquire measured values recorded in the
instrument’s memory over a USB connection

By connecting the RM3548 to a computer with a USB cable*, you
can download measured values stored in the instrument’s memory.
*Since the RM3548 provides a mass storage class (read-only) USB
interface, there is no need to install special driver software on the

Temperature conversion function and interval measurement:
Useful in temperature-rise testing

Temperature increase (Δt) is obtained and displayed by converting resistance measurements and ambient temperature.
The maximum temperature increase needs to be determined when current is applied especially for verifying motor
windings or transformers.The interval measurement function can be used to take measurements at a user-specified
interval from the start of measurement. Since measured values can be recorded in the instrument’s memory, the
maximum temperature can be easily estimated.
*The temperature conversion function cannot be used simultaneously with the temperature correction function and length conversion function.

➀ When a motor or coil has thermally stabilized at room temperature,

measure the resistance (r0) and ambient temperature (t0) before applying
➁ Excite the coil, and when the temperature increase appears to saturate,
remove the excitation.
➂ After removing excitation, determine the temperature (∆t1 to ∆tn) from
the resistance (rt) measured at each specific time (t), and the ambient
➃ Project the curve through the collected temperature data (∆t1 to ∆tn) to
estimate the maximum temperature increase (∆t).